1. ACirExs7:R. 341 



barljcls short, simple. Osi,cous KJiields Hinall and distant from one 

 another, deeply sculptured and coarsely radiated, lU-12 on the back, 

 2d-[i2 on the sides, and about iS along the abdomen. Skin Avith 

 numerous scattered, irregular, stellate ossifications and smaller 

 Tirickles. Tlic greater part of the anal below the dorsal, D. 35. 



Kivcrs of the llussian Empire. Danube. 

 a. Stutfed, G feet long. Russia. Purchased of Mr. Warwick. 



Acijyenaer hecleln, Fitz. & Ilcck. Ann. Wien. Mus. i. p. 303, 

 taf. 2(i. fig. 4, and taf. 29, figs. 11 & 1 2 (or Hcckcl, Sitzgsber. Ak. Wiss. 

 Wien, ]b-")l, vii, p, 500, taf. 24. fig. 3; or Ilcck. & Kner, Siisswas- 

 scrf. p. 357), from the Adriatic, does not appear to be a distinct 

 species. It has been distinguished from yl. <j'nldcnstadtii on account 

 of its somewhat shorter and more rounded snout ; the shields arc 

 less coarsely sculjjtured ; and the stellate ossifications arc of a more 

 uniformly small size. Golowatschof also believes it to be identical 

 with A.yuldenstadtil (Bull. Soc. Nat. Mosc. 1857, ii, p. 542). 



14. Acipenser liopeltis. 



Snout rather short and pointed, its lengtli being contained twice 

 and two-thirds in that of the head ; it is covered above and on the 

 sides with numerous small, dense scutes. iJai'bels long, simple, 

 nearer to the end of the snout than to the eye. Osseous shields of 

 moderate size, distant, finely sculptured, rather smooth ; 1 2 on the 

 back, 33 on the side, and 9 along the abdomen, the latter being very 

 narrow. Skin with numerous rainufe prickles and larger stellate 

 ossifications. A curved series of small scutes crosses the cheek ver- 

 tically. The greater part of the anal below the dorsal. Dorsal fin 

 as high as long, with 36 rays. The first upper caudal fulcrum 

 small. Dark brown. 



Mississippi. 



a. Stuffed, 44 inches long. 



15. Acipenser brevirostris. 



Acipeiiser brevirostrum, Lcsucur, Trans. A)n. Phil. Soc. i, p, 890; 

 JJrcDidt c^ IMzehnnj, Med. Zool. ii. p. 13, taf, 1. fig. 2; Fitz. .S 

 Heck. Ann. Wien. Mus. 1. p, 31;} ; Uelcai/, JVew York Fmm. Fish. 

 p. 345, 



obtusirostris, Lovctzky, Nouv. Man. Soc. Nat. Mosc. iji. p, 'J57. 



Snout very short and obtuse, about one-fourth of the length of 

 the head ; barbels short, simple. Osseous shields rather small and 

 distant from one another, finely radiated and granulated ; b-10 on 

 the back, 22-28 on the sides, 6-8 along the abdomen. Skin very 

 sparingly covered with minute prickles and very small scattered 

 stellate ossifications. The greater part of the anal below tlie dorsal. 

 D. 30. 



Atlantic coasts of the United States. 



it. Stuffed, 31 inches long. Presented by E. Doubleday, Esq. 



